- From: Konrad Lanz <Konrad.Lanz@iaik.tugraz.at>
- Date: Mon, 27 Mar 2006 18:58:28 +0200
- To: public-xml-core-wg@w3.org
- Message-ID: <442819B4.6000002@iaik.tugraz.at>
Dear all, as links in the text are looking ugly in the mailing list archive I'll rather post the following "text-only" version. I plan to post right after Wednesday's conference call. best regards Konrad Lanz #--- snip --- Dear T. Berners-Lee, R. Fielding, L. Masinter, According to an email by John Boyer [1] we need to apply the inheritance rule[2] to xml:base when canonicalizing a XPath node-set over a XML document using C14n's [3] successor Canonical XML 1.1 [4]. This can be critical when nodes in a document become an orphan. For a simple example cf. to the post by Henry S. Thompson [5] where critical xml:base context could be lost by for instance applying an XPath-Filter[6] (XPath-Filter 2.0 [7]). Consider the following <a> <b xml:base="test1/somefile1.ext#abc?def"> <c xml:base="test2/somefile2.ext"/> </b> </a> with the 'b' being clipped out, we'd get <a> <c xml:base="test1/test2/somefile2.ext"/> </a> and the relevant information of xml:base gets pushed down to the child nodes. If b's xml:base was an absolute URI one would absolutize using the algorithm in 5.2 in RFC 2396 [8]. However the example above requires the joining of two relative URIs which we believe is not defined in RFC 2396 [8]. It may nevertheless be defined in RFC 3986 [9] in section "5.2. Relative Resolution" by applying applying the algorithm in 5.2 ignoring the note "that only the scheme component is required to be present in a base URI". Our question is: Is this covered in the scope of RFC 3986 [9] ? The group currently discusses the resolution above as an alternative to adapting section 5.2 step 6 [10] of RFC 2396 [8]. (currently referenced in xml base [11] and C14n [3]) or not to apply inheritance rules [11] at all when nodes in a document become an orphan. Your comments are greatly appreciated. best regards on behalf of the xml-core-group Konrad Lanz [1] http://lists.w3.org/Archives/Public/public-xml-core-wg/2006Mar/0004.html [2] http://www.w3.org/TR/xmlbase/#resolution [3] http://www.w3.org/TR/xml-c14n [4] http://www.w3.org/XML/Group/2006/02/WD-xml-c14n11 [5] http://lists.w3.org/Archives/Public/public-xml-core-wg/2006Mar/0036.html [6] http://www.w3.org/TR/xmldsig-core/#sec-XPath [7] http://www.w3.org/TR/xmldsig-filter2/ [8] http://www.ietf.org/rfc/rfc2396.txt [9] http://www.ietf.org/rfc/rfc3986.txt [10] http://lists.w3.org/Archives/Public/public-xml-core-wg/2006Mar/0041.html [11] http://www.w3.org/TR/xmlbase/#resolution #--- snip --- -- Konrad Lanz, IAIK/SIC - Graz University of Technology Inffeldgasse 16a, 8010 Graz, Austria Tel: +43 316 873 5547 Fax: +43 316 873 5520 https://www.iaik.tugraz.at/aboutus/people/lanz http://jce.iaik.tugraz.at Certificate chain (including the EuroPKI root certificate): https://europki.iaik.at/ca/europki-at/cert_download.htm
Received on Monday, 27 March 2006 16:58:38 UTC